ABAP Select data from SAP table DD02D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DD02D table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to DD02D. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the DD02D table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_DD02D TYPE STANDARD TABLE OF DD02D,
      WA_DD02D TYPE DD02D,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <DD02D> TYPE DD02D.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DD02D.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DD02D
  INTO TABLE IT_DD02D.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DD02D
*  INTO TABLE @DATA(IT_DD02D2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_DD02D INDEX 1 INTO DATA(WA_DD02D2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DD02D ASSIGNING <DD02D>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DD02D>-TABNAME = 1.
<DD02D>-TABCLASS = 1.
<DD02D>-SQLTAB = 1.
<DD02D>-BUFFERED = 1.
<DD02D>-DDTEXT = 1.

ENDLOOP.

LOOP AT IT_DD02D INTO WA_DD02D.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DD02D-AUTHCLASS, sy-vline,
  WA_DD02D-MAINFLAG, sy-vline,
  WA_DD02D-CLIDEP, sy-vline,
  WA_DD02D-CONTFLAG, sy-vline,
  WA_DD02D-TABCLTEXT, sy-vline,
  WA_DD02D-SUFFIX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DD02D you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_DD02D TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_DD02D INTO WA_DD02D.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_DD02D-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DD02D-DATATYPE.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_DD02D_STR, 
TABNAME TYPE STRING,
TABCLASS TYPE STRING,
SQLTAB TYPE STRING,
BUFFERED TYPE STRING,
DDTEXT TYPE STRING,
AUTHCLASS TYPE STRING,
MAINFLAG TYPE STRING,
CLIDEP TYPE STRING,
CONTFLAG TYPE STRING,
TABCLTEXT TYPE STRING,
SUFFIX TYPE STRING,
EXISTTEXT TYPE STRING,
APPTAB TYPE STRING,
MXTAB TYPE STRING,
FLAT_STRU TYPE STRING,
DATATYPE TYPE STRING,
STRNAME TYPE STRING,
DBTABNAME TYPE STRING,
SQLTAB10 TYPE STRING,
BASETYPE TYPE STRING,
ALWAYSTRP TYPE STRING,
IS_GTT TYPE STRING,
SHARINGTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DD02D_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_DD02D_STR-TABNAME sy-vline 
WA_DD02D_STR-TABCLASS sy-vline 
WA_DD02D_STR-SQLTAB sy-vline 
WA_DD02D_STR-BUFFERED sy-vline 
WA_DD02D_STR-DDTEXT sy-vline 
WA_DD02D_STR-AUTHCLASS sy-vline 
WA_DD02D_STR-MAINFLAG sy-vline 
WA_DD02D_STR-CLIDEP sy-vline 
WA_DD02D_STR-CONTFLAG sy-vline 
WA_DD02D_STR-TABCLTEXT sy-vline 
WA_DD02D_STR-SUFFIX sy-vline 
WA_DD02D_STR-EXISTTEXT sy-vline 
WA_DD02D_STR-APPTAB sy-vline 
WA_DD02D_STR-MXTAB sy-vline 
WA_DD02D_STR-FLAT_STRU sy-vline 
WA_DD02D_STR-DATATYPE sy-vline 
WA_DD02D_STR-STRNAME sy-vline 
WA_DD02D_STR-DBTABNAME sy-vline 
WA_DD02D_STR-SQLTAB10 sy-vline 
WA_DD02D_STR-BASETYPE sy-vline 
WA_DD02D_STR-ALWAYSTRP sy-vline 
WA_DD02D_STR-IS_GTT sy-vline 
WA_DD02D_STR-SHARINGTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.